Evacuator



May 22, 1923. 1,456,342

C. C. STEWART EVACUATOR Filed Nov. 1'7, 1920 2 Sheets-Sheet 1 May 22, 1923.

c. c. STEWART EVACUATOR 2 Sheets-Sheet 2 Filed Nov- 17 1920 To all whom it may concern:

Patented May 22, 1923.

A UNITED STATES PATENT OFFICIE.

EVACUA'I'OB.

Application filed November 17, 1920. Serial No. 424,801.

Be it known that I, CORNELIUS C. S WA T, a citizen of the United States, res ding in Philadelphia, Pennsylvania, have lnvented certain Improvements in Evacuators, of

which the following is a specification.

My invention relates to evacuators of the type employed in connection with the dr ers of paper making machines for removlng from the drier the water resulting from the condensed steam employed in the drying process. I

One object of my invention 1s to provlde an improved method of construction possessing the advantages of great simplicity and low production cost, a further ob ect being to so construct the evacuator that a free and unobstructed passage for the water is provided.

In the attached drawings:

Figure 1, is a plan view of an evacuator with the top plate removed, made 1n accordance with my invention;

Fig. 2, is an elevation of the assembled evacuator Fig. 3, is a partial plan view of the top plate showing the intake port and the scoop;

Fig. 4, is a partial section of the evacuator on the line H, Fig. 1; 1

Fig. 5, is a partial section on the line 55, Fi 1 Fig: 6, is a detached perspective of corresponding halves of the top and bottom plates;

Fig. 7, is aperspective of one sectlon of the partition, and

Fig. 8, is a partial section illustrating a modification of the attaching means for the top andbot-tom plates.

With reference to the drawings, my evacuator consists of a hollow drum 1 having extending between the two faces thereof on the inside a spirally arranged partitioning wall 2, as most clearly illustrated in Fig. 1, said wall extending substantiallyfrom the periphery to a point near the center of the drum. An aperture 3 is formed in one face of thedrnm, in the top plate 1 in the present instance, substantially at the periphery thereof for the admission of water or other liquid to the interior of the drum, and a discharge port 4 is formed-in the center, preferably of the opposite face of the drum, as in the present instance in the bottom plate 1". A suitable scoop 5 is established at the admission opening 3 whereby when the drum is revolved the liquid is guided into the said aperture, said liquid after entering the drum being carried to the center through the spiral passage formed by the partition 2, and

being finally discharged through the port 4. The device and its method of operation is well known to those acquainted with the art.

In the construction of my evacuator, I

preferably form the drum casing of foursubstantially semicircular portions, two of said semicircular portions forming together one face andthe sides of the drum, and the other two constituting the opposite face. One of each of these pairs of semicircular portions are shown in Fig. 6, the portion 6 comprising a semicircular disk 7 having extending from the curved edge thereof aflange 8 and from the straight edge thereof but in the opposite direction a flange 9, while the lower portion 10 c-omprisesa disk 11 corresponding to the disk 7 andhaving' extending'from the straight edge thereof a flange'12. These portions-are adapted to fit together, the lower edge of the flange 8 meeting in the present instance the curved edge of the disk 11, and in the form shown in Fig. 4:, the portions are adapted to be secured together by welding along these meet: ing edges of the said flange and disk. These two portions, -6 and 10, together form substantially one-half of the drum casing,'the

opposite halfbeing formed by corresponding but oppositely constructed semicircular portions 6 and 10 The respective halves of the drum casing thus formed may be secured together by bolts 13 passing through the flanges 9 and 9, and the corresponding flanges 12 and 12 respectively upon the other half. 'Washersor gaskets 14: placed between the flanges renders the joint entirelywatertight, while to further strengthen the construction, rein forcing straps 15 may be employed, one bearing against each'of the outer faces of the The respective casing portions are pref-.

up the metal from the inside of the said disk portions, as most clearly illustrated in'Figs. 4., 5, and 6. When the drum portions are assembled, these recesses are such as to form in each face thereof a continuous spiral starting at a point substantially at the periphery of the drum and advancing to a point near the center, the spirals being identical in the two faces and symmetrically arranged with respect to each other. The function of these recesses is to receive and retain in position.

the element or elements which constitute the partitioning wall 2. The said partitioning wall 2 is preferably made in substantially semicircnlar segments 2, as shown in Fig. 7, suchthatthere is a segment for each corresponding pair of grooves in the respective lialves of the drum casing. Thus, the respective halves of the casing being formed in the manner previously described, the semicircular sections 2 of the partitioning wall 2 are inserted in their respective grooves, this being done by placing oneend of the said partition. sections in the exposed ends: of the grooves where they meet the straight sides ofthe disks in which they are formed, and pushingthe said partition section inwardly ;untilit has assumed its proper position. The partitions being in place, they may be secured to the casing by spot welding along the backs of the grooves, Where the sections of-the casing are joined together, as illustrated in Fig. 7, in such manner that they may be disassembled, it is preferred that in each case:the partition sections be welded to the casing along one edge only and that the welded edges alternate in alternate sections 1 fromone face of the casing to the other. In

this manner, the said partition sections will be secured in alternation to opposite sides of the casing, and an equal number of sections will be attached to each of the four portions of the casing, greater rigidity and strength resulting. The modification illustrated in Fig. 8, shows a flange 8 which rests upon the inner surface of, the disk 11, said flange and disk being; secured together by means of .bolts 17 which pass therethrough. A gum gasket 18 inserted between the flange and the disk makes a water-tight oint.

It. will be noticed that the corresponding flanges 8 and 8 upon the portions 6 and 6,

1: respectively, and the partition sections 2' are extended so as to overlap when the evac uator i is assembled, so that a close joint is formed between the respective sections. It will alsobe noticed that in order to allow for .the discharge port 4, it is necessary to cut away a portion of the flange 9 at the center, said cut-away portion being such as to permit alsov the addition of a flange 19, which may be attached by means of bolts 19 around a the. aperture 4, as clearly shown inFig. 5,

this flange being for thereception of a suit able pipefor carrying away the discharged water, l

It will be understood that considerable modification of the invention is possible-with no departure from the essential features of the invention. It is not intended for example that the invention shall be limited to grooves or recesses formed in the body of the casing itself, since grooves suitable for the reception of the partition wall may be made in numerous ways.

I claim:

1. An evacuator comprising a hollow drum,,the faces of said drum havingcorre spondingly disposed spirally arranged grooves in the inside thereof, partitioning a hollow drum of which the said latter flanges constitute the sides, grooves on the inside of the faces of said drum, said grooves being such as to form corresponding and substantially continuous spirals on the re spective faces extending substantially from the periphery to the center thereof, a pa rtitioning wall established in said grooves, a

-port at the periphery of the drum, and a 9 port at the center of one of saidfaces.

3. An evacuator comprising four semi-j circular flanged elements attachable in pairs to form respectively; one half of a hollow drum, meansfor uniting, said halves to complete the said drum, grooves on the inner faces of said elements and so arranged that when the drum is assembled said grooves form corresponding and substantially continuous spirals on the faces of-said' drum, said spirals starting substantially at; the periphery of the drum andending. ata point near the center, semicircular partition ele ments established in said grooves, an ad-. mission port at the periphery of. the drum, and an exhaust port at the center ofone of v the said faces. I v

4;, In an evacuator, a hollow drum-comprising substantially semicircular portions adapted for detachableconnection with eachother, and partitioning elements in eachof said portions adapted when the latter are connected to form a substantiallycontinuous spiral partition extending.substantially near the center. CORNELIUS C. STEWVART.

5.: their edges to the said other. elements to form from the periphery of the drum to a point- 

